Re: Allow parallelism in input/regression/lilypond-book/ (issue 547680043 by address@hidden)

[David Kastrup]

Dan Eble <address@hidden> writes:

> On Feb 23, 2020, at 06:08, Han-Wen Nienhuys <address@hidden> wrote:
>> I think we should do both: the lilypond runs in lp-book should be
>> protected by some sort of lock, and we should use both CPU_COUNT=M and
>> -jN.
>> 
>> then worst case, you have M lilypond processes and N-1 other jobs.
>
> What would you recommend to a developer who doesn't want to run more
> than J = M + N - 1 concurrent jobs due to lilypond development?  What
> values of M and N would serve best?
>
> On Sun, Feb 23, 2020 at 12:00 PM <address@hidden> wrote:
>> So wouldn't it appear that the way to exploit parallelism with
>> lilypond-book, short of writing its own jobserver, is to use CPU_COUNT
>> like we did before?
>
> Making lilypond-book a client of the GNU make job server sounds like an 
> option.
>
>   "Sharing Job Slots with GNU make"
>   https://www.gnu.org/software/make/manual/html_node/Job-Slots.html

But that still doesn't solve the problem that the database approach of
lilypond-book does not work for running multiple lilypond-book jobs in
parallel.

-- 
David Kastrup